Thousands of revelers in outlandish costumes will fill the streets of New Orleans as the city celebrates Mardi Gras Day.

Powerful storms bearing a threat of tornadoes are expected to punch through Louisiana and other parts of the South on Tuesday.

Jefferson Parish officials are canceling Mardi Gras Day parades because they are worried strong winds could flip floats, send tents flying and create other unsafe conditions. Why it matters: It's the first time the holiday's parades have been canceled in recent memory,

Officials are rushing to reschedule Mardi Gras celebrations and warning revelers against brining umbrellas and tents as powerful storms with a threat of tornadoes are expected to strike Louisiana and other parts of the South.

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In the wake of the New Year's New Orleans attack that killed 14 people on Bourbon Street, authorities are boosting security throughout the city for Mardi Gras festivities. NBC News' Jesse Kirsch speaks with New Orleans officials on the expanded security in the city.

Security precautions are heightened in New Orleans as the city celebrates Mardi Gras. This comes after a shocking terrorist attack on Bourbon Street on New Year's Day. CBS News' Kati Weis reports.